草甘膦废盐水中有机物臭氧氧化过程的强化分析  

Intensification of ozonation process of organics in glyphosate waste brine

作　　者：陈威涛 高锦炜 刘梅红[2] 俞三传[1] CHEN Weitao;GAO Jinwei;LIU Meihong;YU Sanchuan(School of Science,Zhejiang Sci-Tech University,Hangzhou 310018,China;School of Civil Engineering and Architecture,Zhejiang Sci-Tech University,Hangzhou 310018,China)

机构地区：[1]浙江理工大学理学院,杭州310018 [2]浙江理工大学建筑工程学院,杭州310018

出　　处：《浙江理工大学学报（自然科学版）》2022年第5期722-728,共7页Journal of Zhejiang Sci-Tech University(Natural Sciences)

基　　金：浙江省重点研发计划项目(2021C03172)。

摘　　要：为实现草甘膦废盐水的资源化利用,采用臭氧氧化工艺去除草甘膦废盐水中的有机物,研究臭氧投加量、反应时间、初始pH对有机物去除率的影响;采用氧化镁(MgO)催化剂对臭氧氧化过程进行强化,研究催化剂投加量对氧化效率的影响;在分析氧化过程自由基特性的基础上,采用自由基猝灭抑制工艺进一步强化氧化过程。结果表明:臭氧氧化对草甘膦废盐水中有机物的去除率随臭氧投加量的增大和反应时间的延长而提高,随初始pH的提高先提高后下降,在臭氧投加量为2000mg/h、初始pH 11.0条件下,总有机碳(Total organic carbon,TOC)去除率在反应4h达到最高值76.9%;MgO催化可提高臭氧氧化效率,在臭氧投加量保持不变、初始pH 10.0、催化剂投加量1.0g/L条件下,反应3h后TOC去除率可达到79.1%;通过去除体系中的碳酸根离子,可进一步提高MgO催化臭氧氧化效率,TOC去除率可提高至85.7%。研究结果可为臭氧氧化草甘膦废盐水中有机物的工艺选择和优化提供一定的指导。This work focused on the removal of organic matters in the glyphosate waste brine through ozonation process for resource utilization of glyphosate waste brine.The effects of ozone dosage,reaction time and initial pH on the removal of organics were studied.The catalyst magnesium oxide(MgO)was firstly used to intensify the ozonation process and the effect of catalyst dosage on oxidation efficiency was explored.Based on an analysis of free radical characteristics,the oxidation process was further intensified through the free radical quenching and inhibition process.The results showed that the removal rate of ozonation for organics in glyphosate waste brine increased with the increase of ozone dosage and reaction time.With the increase of initial pH,the efficiency of ozonation first increased and then decreased.With an ozone dosage of 2000mg/h and an initial pH of 11.0,the removal rate of total organic carbon(TOC)reached a maximum 76.9%after 4hof reaction.The catalyst MgO can enhance the efficiency of ozonation.When the ozone dosage remained unchanged,the initial pH was 10.0and the catalyst dosage was 1.0g/L,the removal rate of TOC can reach 79.1%after 3hof reaction.Moreover,the catalyzation and ozonation efficiency was further intensified by removing carbanions in the reaction system and the removal rate of TOC could grow to 85.7%.The research results will provide some guidance for the process selection and optimization of ozonation of organic matters in glyphosate waste brine.

关 键 词：草甘膦废盐水 氧化镁 催化臭氧氧化 TOC去除率 自由基猝灭抑制 

分 类 号：TQ457.2[化学工程—农药化工]